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Posted to issues@hive.apache.org by "Matt McCline (JIRA)" <ji...@apache.org> on 2015/09/28 22:17:05 UTC
[jira] [Updated] (HIVE-11981) ORC Schema Evolution Issues
(Vectorized, ACID, and Non-Vectorized)
[ https://issues.apache.org/jira/browse/HIVE-11981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt McCline updated HIVE-11981:
--------------------------------
Attachment: ORC Schema Evolution Issues.docx
> ORC Schema Evolution Issues (Vectorized, ACID, and Non-Vectorized)
> ------------------------------------------------------------------
>
> Key: HIVE-11981
> URL: https://issues.apache.org/jira/browse/HIVE-11981
> Project: Hive
> Issue Type: Bug
> Components: Hive, Transactions
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: ORC Schema Evolution Issues.docx
>
>
> High priority issues with schema evolution for the ORC file format.
> Schema evolution here is limited to adding new columns and a few cases of column type-widening (e.g. int to bigint).
> Renaming columns, deleting column, moving columns and other schema evolution were not pursued due to lack of importance and lack of time. Also, it appears a much more sophisticated metadata would be needed to support them.
> The biggest issues for users have been adding new columns for ACID table (HIVE-11421 Support Schema evolution for ACID tables) and vectorization (HIVE-10598 Vectorization borks when column is added to table).
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